According to the semiconservative model, after one round of replication, every new DNA double helix would be a hybrid that consisted of one strand of old DNA bound to one strand of newly synthesized DNA.
A thorough medical evaluation is necessary to determine the cause of a slow heart rate. An electrocardiogram (EKG or ECG), laboratory tests, and other diagnostic studies may be done. Potential medical causes of a slow heart rate include: abnormal heart rhythms.
A slow heart rate is a condition known as bradycardia. A normal heart rate falls in the range of 60 to 100 beats per minute. According to the Mayo Clinic, a person with a slow rate, or bradycardia, has a heart that beats fewer than 60 times per minute. For some people, there are no problems with the slow heart rate.